Topsoil and nutrient runoff are two serious challenges of sustainable agriculture. Perennial crops can help solve these problems by preserving cropland productivity without requiring substantial dietary and manufacture shifts. ...

Screening

Screening, in general, is the investigation of a great number of something (for instance, people) looking for those with a particular problem or feature. One example is at an airport, where many bags get x-rayed to try to detect any which may contain weapons or explosives. People are also screened going through a metal detector. Even though the procedure aims at a large number of screens, it is always equivalent to sampling in statistics, because the complete population is almost always inaccessible for screening.